On Tue, 24 May 2005, Paul M Foster wrote:
> On Thu, May 19, 2005 at 11:00:02PM -0400, Bob Stia wrote:
>
> > cd $FROM_DIR
>
> Someone else mentioned $VARNAME versus ${VARNAME}. No, you won't find
> this exact thing in your script, but the above is an example of what the
> poster meant. When he said "VARNAME", he meant "variable name". Anything
> preceded by a $ in a bash script is a variable. In this case, the
> variable name is $FROM_DIR. In bash, you can also say ${FROM_DIR}, and
> it means mostly the same thing. In most cases, it's a matter of
> preference which form you use. In some cases you need to use ${FROM_DIR}
> instead. But I don't think you have any of that kind of thing in your
> script.
The difference between $VARNAME and ${VARNAME} arises when you set VARNAME
to something (for example):
VARNAME=foo
Then
echo $VARNAMEABC
will print nothing (assuming nothing's in a variable called "VARNAMEABC")
while
echo ${VARNAME}ABC
fooABC
Using {} can never hurt (when used properly) and can sometimes help.
> > for i in *.$FROM; do
> >
> > echo $1
>
> The above appears to by line 35 by my count. Terms like $0, $1, $2
> indicate the parameters with which you call the program. $0 is always
> the name of the script. So for example, if you said:
>
> bobs_script joe sam
>
> then those variables would be as follows:
>
> $0 = bobs_script
> $1 = joe
> $2 = sam
>
> You can see from this how it would progress; the next thing on the
> command line corresponds to the next number.
>
> In this case, I don't think you're actually passing the script any
> parameters, so the $1 is meaningless. I suspect this should be
>
> echo $i
>
> instead of echo $1. That way the script would tell you what file it was
> processing for each loop.
What he said.
> If my count is right, I don't know why your script is telling you this
> line is an unknown command. I suspect there is some alteration between
> the running script and what you posted. Otherwise, it doesn't make
> sense.
Is this /home/bob/commands/ImageMagickConvert ?
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